oppose vs square off

oppose

verb
  • To present or set up in opposition; to pose. 

  • To object to. 

  • To place in front of, or over against; to set opposite; to exhibit. 

  • To attempt to stop the progression of; to resist or antagonize by physical means, or by arguments, etc.; to contend against. 

square off

verb
  • To get ready for a confrontation (debate, argument, fight). 

  • To increase the boxiness of (a design). 

How often have the words oppose and square off occurred in a corpus of books? (source: Google Ngram Viewer )